SOLD: Kay Double Bass, M1 Model Kay Bass Viol 1941


Hello! Thank you for viewing one of our SOLD double bass listings!  This instrument is no longer for sale, but check out what’s currently available in our list of Vintage and Used Double Basses. Upton Bass is also the proud builder of new custom upright basses at every price point. We want to help you find the perfect bass!  Contact us at or call the shop at +1 (860) 535-9399

Early Kay M1 Double Bass, a well maintained and played example of the flagship violin-cornered Kay M-1.  Ready to gig, includes bass bag.


1941 Kay Double Bass, M-1 Model Bass Viol, Serial 7940. Here’s a well cared for early Kay with violin corners and nice original sunburst.

This American classic plywood upright bass has the vintage mojo Kay enthusiasts prize. Has had work done but very original. Even has the old Kay emblem on the tailpiece.

Serial number puts it in early 1941 production according to widely circulated Kay double bass production lists.  Scrapes and dings, looks the part of an 80-year old jazz and roots workhorse. Replacement neck and fingerboard, looks to be Engelhardt, work was probably done in the 80’s based on wear. Varnish was touched up to make it match.

These never stick around for long and most of these early M1s are on their 9th life. Nice to see this one so healthy.

Looking for a new American-made plywood double bass with none of the vintage issues?  Consider the UB Standard Laminate Double Bass, built right here in Connecticut alongside our finest models. Features our big open sound, famous setup ergonomics and thick ebony board, all for less than a vintage instrument.


Upton Bass String Instrument Co. specializes in building award-winning custom double basses and offers accessories for the double bass. Upton Bass also services all instruments and bows of the violin family with world-class restoration and repair, to view our online restoration portfolio visit

Upton Bass is ready to offer advice and answer any questions regarding double basses or related bass topics. Please contact UB at or call the shop at +1 (860) 535-9399. Hours of operation Tuesday through Saturday 10 am – 6 pm. The Workshop (The Barn) and showroom are located in Mystic, Connecticut conveniently between Boston and NYC.