The grip strap is unmarked.
Understand difficulty in seeing sear safety. Concentrate on fourth and fifth pictures (counting from top photo), esp. pic showing chamber marking. Sear safety is perhaps 2/3rds width of usual, is proportionally thinner, with proportionally smaller rivet, with flat rivet head.
Have Official Guide (3rd edition, Robert H. Balderson). See the mark you reference (pg 129 in 3rd edition). Cannot say I have any faith in the work, due to many, many errors and assertions w/o supporting evidence.
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