In the mid 60's I was in a band, the lead guitarist of which had a Grimshaw, blonde semi acoustic electric. It did not have the Rickenbacker truss rod cover and it would have been several years old, even in 1964.( have a photo, still) I subsequently bought a Grimshaw Les Paul shaped guitar in Tobacco sunburst, which played like a dream but the pickups were weak and squeaky. That would have been 1966-67. I didn't get a Les Paul until 1971. Exchanged it at a shop in Bletchley for a Marshall 8X10 cab. Grimshaws looked great and were well made, but the sound.....sadly.