Hi Victor, welcome to Outdoorking.
The 11-497 is one of the Victa-badged MTD mowers. Unfortunately I don't know what the equivalent MTD model number was - if you need that I suggest you send a Private Message to Bruce, the site owner and administrator. Bruce is a dealer and has access to such information. The proper model number may be useful for obtaining documents and spare parts from US sources.
If you post the Model, Type and Code information stamped on your Briggs engine, from that we can tell you the engine's date of manufacture, which is probably just a couple of months before the mower was made.
The numbers were stamped onto the cooling air cowl near the intake port for most models, but there are other locations that were sometimes used. I suggest you look at the Briggs video showing you where to find them. It is here:
http://www.briggsandstratton.com/us/en/support/faqs/how-do-i-identify-a-briggs-and-stratton-engine
