I have come across several NOS boxes of these rebuilt spark plugs. They are full boxes of 10 from the 1930's. Great graphics and display nicely. See photos. $40 per box. first come first served. I have at least 6 boxes and may get more. Thanks
Mike Haggard

More pictures available. Each plug is wrapped in original paper and boxes are unopened except for the few I needed to take pictures of. Boxes are in great shape but not all are identical. They look great for 80+ years old.

Are any 14mm/9/16" base diameter? Please show image of the plug, thanks.

Here are a few more pictures. Hope this helps.

Boxes are in good shape for the most part. Some shelf wear. The inside boxes are almost perfect - untouched.

Pm sent

All sold. PM me if you wanted some. I may be able to get a couple more boxes. Not sure right now.