How do I definitively age my Prestige 250?

I have a Sunrise Sunburst Prestige 250 and I have read that if it has Westone in script on the headstock, it is 1982/83. I also read somewhere that it should have a serial number, but can't remember where I saw it  and Google hasn't been any help retracing my steps.

Any ideas where the serial number is or how else I could find out the age? Apologies if it's a dumb question, but it's not only my guitar which is getting on a bit 

Nice guitar..

Should be able to find it on the rear of the headstock at the top.

Some are hard to see due to the paint/lacquer but it should be there.

the serial number should be on the back of the headstock, right at the top edge
like this one;

the first digit indicates the year of production, the next two digits indicate the month of production, the final four digits are the production numbers
this one would be; 2=1982, 05=May, product 1743
my speculation is that production numbers include all westone models built each month

so, how about some pics of your guitar?

Wow, no wonder I couldn't find the serial number, talk about indistinct! Thanks for that, turns out it's September 1982, 2425. Pic below. The sharp-eyed may notice an extra mini toggle switch. It was put in to give more switching options for the pickups, but I wasn't convinced it did anything for the sound, so disconnected it. Was thinking maybe use it to create a single coil sound on one of the pickups, but never got around to it 

Pity about the mini switch could have just put a pull/push switch at one of the volume controls would have done whatever you were trying to achieve without drilling a hole in a fine guitar.

Does it still have the stock wiring?

Not really my idea. But this was back in 1982 and I'll admit I was a bit naive and the guitar technician didn't say how he was going to achieve it. Something to do with the phasing of the pickups I think but it only interrupted the wiring on one pickup as far as I can see.

Is it the stock wiring? I have no clue, but as I said there only seems to be the wires from one pickup which were wired into the switch. Would I have gone through with it now knowing what I do now? Nope, just another dropped stitch in life's rich tapestry.....

Wiring diagram is HERE

Great machine there... top quality on those 250's.