Can you identify this?

[daz]

Hi there,

I'm currently in the middle of a top end rebuild and after removing the barrels, found they had been worked on.
On closer inspection i found letters and numbers had been engraved into the side of each.

Does anyone here know who may have worked on them?

The letters say:

T1379 (or could be an "S")
T1159

Sorry about the picture quality

[fred]

ive got a tuned kr1 right barrel with lots of hand stamps on ,,,, kr1 barrel got several hand stamped numbers i`me guessing from work done or invoices ,707,737,22874,22420,18390,and on the front skirt 22674,11166 and ss400 ,i recon this is just to keep track of work done ,