Martin Sassmann trained at Neupert.

Martin Sassmann, born in 1924, was a Second World War pilot who apprenticed at the keyboard maker J.C. Neupert from 1948 and qualified as a master craftsman in 1953, according to the Eric Feller collection of historical instruments. In 1955 he opened his own workshop in Lennep, now part of Remscheid, in the Bergisches Land, and moved it to Hückeswagen-Wiehagen in 1966.

It grew quickly in its first fifteen years of trading. Feller’s collection notes say the workshop made about 1,500 instruments between 1955 and 1969 with about twenty staff. The business became a limited company, a GmbH, in 1987; the firm’s own website subtitles it “Meisterwerkstätten für historische Tasteninstrumente” — master workshops for historical keyboard instruments.

New owners followed. The company’s site says Gunther Karnstein and Markus Worm took over at the start of 1992, and that Karnstein was sole owner from the end of 1999. It also says the firm won the German musical-instrument prize for harpsichords in 1994; we report that as its claim.

Insolvency in 2008.

The company register tells the end. Saßmann GmbH was registered at the Cologne court on 2 February 1987; a provisional insolvency administrator was appointed on 28 April 2008; the company went into liquidation on 16 June 2008; insolvency proceedings were ended by court order in March 2015; and the company was deleted from the register on 15 December 2015.

Its website, however, still remains online and reads as if the firm were still trading; its security certificate expired in April 2026. A collector’s source gives a closure date of 2009 and different details of the company’s names; we use the register’s dates. Under our rule for defunct businesses we say it plainly: Sassmann GmbH entered insolvency in 2008 and no longer exists.

The name’s line of descent in the trade is clear and well documented. Sassmann learned at Neupert, which still trades near Bamberg; his own firm, founded in 1955, entered insolvency in 2008.

Revival, then historical.

The modern harpsichord was reinvented twice. First in Paris: the Cité de la musique says Wanda Landowska’s name “reste indissolublement lié au clavecin Pleyel (16 pieds), modèle conçu à partir de ses suggestions, inauguré en 1912” — remains inseparably linked to the Pleyel 16-foot harpsichord, built to her suggestions and launched in 1912, to which she stayed faithful throughout her career. Instruments in that style are now called “revival” harpsichords.

Then in Boston. Harvard Magazine records that Frank Hubbard and William Dowd “independently pursued apprenticeships with disciples of Dolmetsch, then founded a harpsichord company in 1949,” and that their serial number one was “modeled on a design by the Flemish Ruckers family.” Wikipedia sums up the difference: they built “on historical principles, rather than the 20th-century modern (now known as ‘revival’) style practised by virtually all professional makers.” Sassmann’s later subtitle — master workshops for historical keyboard instruments — shows the firm following that shift.

A museum now holds one of the trade’s great collections. Nuremberg’s Germanisches Nationalmuseum says that in 1969, with help from the Volkswagen Foundation, it acquired “Die Klavierhistorische Sammlung des Bamberger Klavierherstellers J.C. Neupert,” which “enthält über 300 Objekte, die meisten davon Tasteninstrumente” — more than 300 objects, most of them keyboard instruments. Sassmann trained in the firm whose collection it was.

The Cité de la musique traces Landowska’s influence forward “aux temps des débuts américains dans la facture de clavecin selon des principes historiques” — to the beginnings of American harpsichord making on historical principles.

In Germany the scale was different. Kurt Wittmayer’s firm in Bavaria made about 440 instruments a year in the 1960s, according to the German Wikipedia, and some 8,430 modern instruments in all before closing in 1995. Across the inner German border, the Ammer workshops in Eisenberg, founded in 1927, built harpsichords with the Leipzig instrument museum from the 1930s, were nationalised in 1972, and continued in family hands, later in the West, until 2017.

Frank Hubbard set out the historical approach at book length in Three Centuries of Harpsichord Making, published by Harvard University Press in 1965; the harpsichordist Ralph Kirkpatrick wrote that Hubbard “unquestionably knows more about the history and construction of harpsichords than anyone alive today.” Hubbard’s former partner William Dowd, who closed his Massachusetts workshop in 1988, built, according to the Boston Globe, “more than 800 instruments that are now played in 26 countries.”

Wolfgang Zuckermann explained his kit in his 1969 book The Modern Harpsichord: “Realizing that most people approach a harpsichord with caution, the way they do a vicious dog, I decided that the only way they might lose their fear of harpsichord maintenance was to go through the process of building the instrument for themselves.”

Germany’s oldest name in the field, J.C. Neupert, founded in 1868, built harpsichords from the 1900s and still works near Bamberg; its historical collection passed to Nuremberg’s Germanisches Nationalmuseum in the late 1960s. The museum had acquired the Rück collection, of about 1,500 pieces, in 1962, making Nuremberg one of the great places to study historical keyboards.

The Smithsonian’s National Museum of American History holds the records of both Boston pioneers — the Hubbard Harpsichord Records and the Dowd Harpsichord Collection — so the American revival is documented in a national archive.

An apprentice’s own name.

Sassmann’s brand was, above all, its founder’s own surname, kept by the owners who followed him, and a subtitle that placed it among historical-instrument makers. It is a reminder that a heritage name can outlive its founder’s involvement but not a failed balance sheet.

For a design guide, Sassmann shows the risk of a website that outlives a company, a problem that also affects Ammer’s old site: a site that still reads as current can mislead buyers years after the business has gone. Compare Neupert, where Sassmann trained, and Ammer, whose website likewise outlived its closure.

Its two homes, Lennep and Hückeswagen, lie in the wooded hills east of Düsseldorf.

For this guide we use a plum grey and a lilac with a serif, an unofficial interpretation. No instrument or mark is reproduced.

Keep Sassmann’s identity on hand — save it to a board in the Made Good inspiration library.