Another Bristish stuff to my collection

Wiki say:
F.T. 37
It is unknown when this device came into service. It is very similar to the F.T. 27, this device was available in an 80 cm base length and possibly also in 1m. The editor owns three -- one complete with its storage box, which also contains an M.B. 4 and M.E. 6 mounting. The M.E. 6 mounting is a very heavy piece of metal! A bill of materials in the box indicates that it is for an F.T. 36, though the outer stamp indicates F.T. 37. The F.T. 37's minimum convergence distance is 250 yards. It appears that its scale illumination is to be provided by a small electric lamp, as several bulbs are packed neatly in the box and the device lacks the handy flip-up cover found on most (all?) F.T. 27s. The bill of material indicates 2 volt accumulators (batteries) would be supplied in the box.
The F.T. 37 had rubber masks to comfortably receive the rangetaker's face as he peered through it.

This seem to be a F.T. 37s , but no found information in the web..















More info are welcome!

Regards
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