Good move, No4MkI(T). As it's a bonafide survey, perhaps it should be a sticky. Also, this thread predates my joining this forum, and perhaps many other's also.

The only info I could add refers to the '51 barrel date. Both my 95L4XXX and 22LXXXX rearsenal carry '51 barrels. Both are park'd. Because of a long ago debate about LB/CA rearsenals the barrel date may be more important than the serial number.

Brad