M1 Garand Trigger Guard Stamps T, R, O, V, Y

[RCS]

These letters start to appear after the drawing numbers were discontinued, I don't believe there is a reference to these letter codes

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[usabaker]

These letters start to appear after the drawing numbers were discontinued,

What year were the drawing numbers discontinued?

[RCS]

the last revision number used on the milled trigger guards was revision 3 which last into early 1942. The milled trigger guards without
the drawing number will sometimes be found with a single letter stamped inside the guard, this lasted until the stamped trigger guard
replaced the milled trigger guard.

The lower band from mid to late 1942 can also be sometimes found with a single letter stamped on the outside