The Vase 40 Trendsetter was a very popular. They were hand assembled and wired with an eyelet board the same as all Vase valve amps.
Pair of 6L6 output valves and 12AX7’s in the preamp and phase splitter. The normal loudspeaker configuration was 2 x 12” loudspeakers in a quad sized cab.
Typically most did not have serial numbers so can be difficult to date precisely.
Maybe late 60’s vintage.
Original 12” MSP Speaker & Celestion G12
Great amp with a lot of head room!