For first time visitors I recommend this archive for some of my best posts.
1519. 12-7/8" tall:
1520. 1" x 7/8", the other side looks the same:
1521. 7-3/4" long:
1522. 8-1/2" long:
1523. 9-1/2" long, from the 1920's, submitted by a visitor:
For more guesses on this tool, take a look at Neatorama.
1524. 9" long:
To submit photos, send them to the address in my profile.
Last week's set is seen below, click here to view the entire post.
More discussion and comments on these photos can be found at the newsgroup rec.puzzles.