Its the last version 1972/73 note fender mounts are present on yours. Note the headtube reinforcement as well. That catalog shot you have is actually behind the times a little and most you would see in 1971 would be more like yours, but without fender mounts. Yours is not a good example to reference because there are so many changes, missing parts, etc... But the base is still there and easy to spot between it, and earlier bikes. and actually easy to tell the versions because of items above (even the fork lowers being pinched rather than tubing) this is fall 1973:
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The other super simple verification is the actual model numbers, Sears used a 3 digit manufacturer identification for the items they sold. so when you see model number plates on bikes, craftsman engines, or just about ANYTHING Sears sold, the serial number has 3 digits a "." and then another set of digits. The ID number for Roper products at that time was 131, Bird was 803, Manco 391, as did others that came and went through though the 1970's/80's that came from different manufacturers. Craftsman engines were made by Tecumseh and their # was 143 which is what your bike would have originally came with.
Roper corporation at that time was Owned by Sears, But Roper was an actual manufacturer of mowers, appliances, etc... People using the name Roper for the one particular bike I believe stems from the fact that they did make 2 versions that were street legal. They had to have a more elaborate ID/manufacturer plate rather than a basic sticker/serial number. Those legal ID plate have to state the actual manufacture on them.......and it wasn't Bird! Yet, all the "experts" will still call them Ropers made by bird
here are one of those ID plates (note the 131 in the model number as well).
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