Carol's Coin Pie Crimpers
Carol Bastable writes:

Antler Coin Pie Crimper

This is an awesome antique "pie crimper," also called a "Jagger Wheel," which is probably the coolest pie crimper ever made. Some have theorized that a frontiersman-type husband made this for hiswife. Or maybe he was just a guy who also liked to cook. Or possibly a crafty and talented woman. They were used to cut and slice dough, just generally. It's made out of a deer antler, and uses athick, early British coin as the crimping wheel. The coin is a massive British 1797 Cartwheel Penny as the wheel. You can still see the "G" on the border of one of the filed edges. The antler is alsopersonalized with what looks like a backwards N. These were used like a pizza cutter with a serrated edge, to cut flour dough. They were mostly used to cut small strips to design a latticework on topof a pie. It's possible also that the lower antler time was used to poke holes in a pie to ventilate it.

To read the complete lot description, see:
Deer Antler Copper Coin Jagger Wheel / Pie Crimper(https://www.ebay.com/itm/Deer-Antler-Copper-Coin-Jagger-Wheel-Pie-Crimper-/303795898987)

Large Cent Pie Crimper Maker Counterstamp
Bob Merchant writes:

1819 U.S. Large Cent, holed in center

Countermarked "MACKRELL & / RICHARDSON / NEW YORK"

Coin has been made into a dough (or pie crust) cutter/crimper.

This business partnership was listed as a "manufacturer of cast bolts, shutter hinges, locks, etc". They also made kitchen tools. It is possible that the coin was countermarked by M&R and thenalso made into a kitchen tool by them.

Date of issue: 1839-1859.
Place of issue: New York City.

Brunk M-74.
Rulau M NY 2112.

Coins as Machine Parts
Ken Spindler writes:

To read the complete lot description, see:
1819 U.S. Large Cent, Counterstamp "MACKRELL & / RICHARDSON / NEW YORK"(https://www.ebay.com/itm/1819-U-S-Large-Cent-Counterstamp-MACKRELL-RICHARDSON-NEW-YORK/133619569670)

To read the earlier E-Sylum article, see:
NUMISMATIC NUGGETS: JANUARY 3, 2020 (https://www.coinbooks.org/v24/esylum_v24n01a23.html)