[Bruce Parker (RIP)]

Darrell, that number is the WD or 'census' number, similar to the CZ or CL numbers on trucks and lorries. My Carrier is a Mk.1* with a similar number CT113649, and is a Mk.1*, Serial No.14606 built March, 1943 as part of contract CD213. Look in the same place along the armour and you'll find the 5-digit serial number and maybe even a C Broad Arrow.

Also, I have drawings to re-make the folding aerial bracket I could send.

As to FV623: hmmm-M, you M-ay have a point. I M-ight reconsider as I'm rather partial to my Widget, Universal, Hand, Type "F" (Canadian) No.2 Mk.2/3***.