That should be 17/12/04 for the date of manufacture. The number breakdown is Model 12F802 Type 1975-B1 Code 0412175.

An Illustrated Parts List pdf download is at:
http://bsintek.basco.com/MDEXResultsPages/PDFDisplayPage.aspx?fileName=18hruJXHnfBhU7y

The Briggs and Stratton Service Manual for this model is P/No 270962.

It is available in the 'Engine Manuals and Parts List' section on this site [paid subscription required], or there are a few free views/downloads of it around. A Google search can find them.

Cheers,
Gadge

"ODK Mods can explain it to you, but they can't understand it for you..."

"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."