1942 Longbranch No.4 MK1* T .. original?

[limpetmine]

The general consensus is that the 71 pre-production snipers were built up on 1943 actions, in the 40L-56L range (or there abouts, don't have my book close by). This is not to say that a 1942 action could have been used. Did it have a scope serial # on the stock heel? As stated, the S51 stamp is the Holland and Holland mark, and was never used by Long Branch.
Here's a few pics of my 1943, one of 71. It was put back in fighting trim thanks to Brian Dick of BDL and Mr. Laidler, my thanks to both!