Hi Glenn,
Our SB guru, Deejay, can fit your serial number into a sequence and probably identify some of the features of your mower, but the serial number does not give us a date of manufacture. However if you post the full series of numbers from your Briggs and Stratton engine's air cowl (beginning with 80202), we can tell you exactly when the engine was made.
With regard to grooming attachments, I suggest you begin with this thread:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=25891&page=1If you need more information than that, Steve, deviosi, is knowledgeable on the subject and has some experience as well.
I have never heard of a broom attachment, but Deejay will probably know if one was ever sold by SB.