Here is the only Sears catalog page I have found so far. It's from 1968 that I got from Wishbook. I don't know how many years Sears had the Tote Cycle listed.
Wishbook is an internet attempt to scan all the department store catalogs. A rather monumental task considering the sheer number of catalog pages from Sears, JC Penney, Wards and more. Over 100 years of history and each catalog could be over 1000 pages. Add seasonal catalogs and good luck just finding all those catalogs.
My own Tote Cycle appears to have the catalog item number as part of the serial number but it doesn't match 1968 catalog numbers.
For many Sears branded bikes the serial number starts with a 3 digit supplier code, a catalog item number then the sequence number.
502 was the supplier code for Murray.
I think 503 was Steyr
my tote cycle has 507. I think that is the code for Huffy (Huffman Bicycle Co)
There are many Sears supplier codes lists on the www but most seem to specialize (appliances or electronics, etc) and none are very complete. 507 isn't on any of them.
An original sprocket pattern is a sure sign of a particular maker. Kinda like finger prints. Most bike makers had unique patterns and would do special versions for various stores or branded names. I changed the sprocket on mine to get more practical gearing. But I see yours seems to match the catalog images. "Huffy The Wheel Sprocket".
Sears had no factories, they outsourced all their branded products. Sears bike brands were JC Higgins, Free Spirit, FS, FS Elite, Ted Williams and Sears.
Steyr of Austria was another supplier of bikes for Sears. Most of those had 2 or 3 piece cranks.
AMF (American Machine & Foundry), formerly Cleveland welding supply was another supplier but AMF made all kinds of sporting goods and I think they had different supplier codes for different categories of gear. AMF even owned Harley Davidson for a while.
I don't think Schwinn was a Sears supplier, at least not since the late 1950s when Frank Schwinn put a stop to making bikes for other brands. I've talked to some who claimed they bought their Schwinn bicycles at Sears.
Columbia, Huffy and Ross were other potential suppliers.
1968 catalog item numbers:
45981 deluxe 3 speed
45980 1 speed
48530 Stowage Bracket
48477C wicker basket.