Vtg Buck Bros 3/16" Cast Steel Socket Mortise Chisel [0.140" width]

Description

For Auction:
Used chisel, as-acquired, approx. 12-7/8" oal including handle, the steel is 8-1/2" oal, the blade is 5-1/2" from tip to waist, and the blade is [0.140"] wide from tip to blade's half-way point.
The 1936 Catalog I found on-line shows their mortise chisels were available in 1/8", 3/16", and up to 3/4". This one is wider than 1/8" and narrower than 3/16", and shows no evidence of being "thinned", ergo it's an unmolested 3/16". Is it Rare?
[my measurements are with a Mitutoyo 505-627 .001" dial caliper, and it is fairly accurate]
I also have  Witherby and Fulton Special chisels in separate Auctions right now,
And I COMBINE SHIPPING!
Payment is required within 7-days after the Auction Ends.
Although my Listing states a 5-day shipping window, I usually ship same or next business day after I receive cleared payment.
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My Photo Reference: 2021-07-10 buck mortise