Vintage UNKNOWN Hone (I Think) (See Microscope Shots) & Below

Description

I know nothing about Sharpening Stones. I inherited these from my father who has had them for 50-75 years.
NO IDEA WHAT THIS IS. Perhaps a Hone
(If you know please send me a message)
Condition is "Used".
Shipped with USPS First Class.
Stone Size (Length x Width x Thickness) = 6 1/4" x 1 1/8" x 1/2"
Smooth
Flexible - this one can be bent slightly. Is it a Hone?
#677 - Sellers Tracking Number to Ensure You Get The Exact Item Pictured in this Listing