RARE! WILLCOX & GIBBS sewing machine attachment TUCKER may be incomplete

Description

Here is an attachment for a vintage Willcox & Gibbs sewing machine, possibly incomplete.
This auction features a sewing machine accessory which I believe is a very early tucker, or tuck marker, by Willcox & Gibbs.  There are 2 round ID stamps, side by side on one section of this piece.  One says, "Willcox & Gibbs Sew Machine CO New York" around the edge, with the appropriate symbol in the middle.  The other says, "H.G. Goodrich Chicago Ill" around the edge and "Pat. Oct. 28. 73" in the middle, referring to 1873, of course.  I don't know whether this is the entire original piece, or only part of it.
I have NO IDEA which machine this item may fit.  I have included a COPY of a page from a Willcox & Gibbs manual which shows an "Improved Tuckmarker" patented 1904.  The tucker in the picture resembles the piece here, and is included for the new owner's information.  I've also added a screw from my stash which fits the opening for a "guide screw" pictured on this page, in HOPES that it may also work on the threads of the machine it's intended to fit.
Please examine all the pictures carefully to asses the condition of this item.  I consider this attachment to be in
good to very good used
condition, considering their probable age, although it MAY BE incomplete.  There is a lot of shine on what's here, with a few small marks of wear, age and use.
NOTE:  If you need any Singer accessories, check out my other auctions - I'm happy to combine shipping.  When purchasing multiple items from me, please use your cart and "request total" when you're finished shopping.  Once everything's packed, I'll send an invoice to pay with the total price of your items, plus the combined shipping cost and any taxes required by your location.  THANKS!
THANKS FOR LOOKING!
Payment and Shipping
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happy customers!
Returns
Returns will be allowed within 30 days of receipt of the item - contact me immediately with any concerns, please. The item must be returned in the same condition in which it was mailed, including protective packaging. Once received and inspected, a refund will be issued.