yes, actually TS58476 LO
I received the BMIHT certificate in the late 90's. This car had a few interesting things we found. The frame was painted red underneath all the crud. It also had the holes and captive nuts and dome bolts for aeroscreens although this was eliminated from normal production. I remember asking the original owner about this. He told me that back in the late 50's he did a bit of motorcross and gymkhanas, etc and he traded in his older TR3 smallmouth which had original aeroscreens. He said Triumph charged him $75. dollars to supply his new 3A with the holes ready for the aeroscreens. I sure wish he saved the bill of sale, but by 1988 when I bought the car the paperwork was gone and the dealer was long gone.
I realize that I am close to the major change in body shell tooling, etc. However, my car has all of the characteristics of the earlier cars before the transition, including:
no plinth under bonnet and boot hinges
wooden door frames
screw terminals on electrical equipment
sloping rear deck
flat section reinforcing in boot lid vs round tubular
dzus-type wind-screen attachment
etc, etc, etc
so, being 1500 or so cars below the transition saved me. I prefer the earlier design - it's a bit more crude