Dating a coliceum bass head

[studioit]

The ser# is 54076, the only red on the front panel is the actual text coliceum bass.

Any ideas?

Thanks
Ian Talcroft

[studioit]

here's a picture.

[Enzo]

Sure. Open it up and read the date codes on the back of the pots. If there are date codes on the tranny, large filters or anything else, check them. The latest date in there is the oldest the amp could be. That assumes the part is original of course.

[studioit]

I don't even want to take the time to open it up. I just want to sell it on ebay and I've seen several different versions.
If anyone knows by looking ( ballpark like 70-75 etc) or from the ser # etc.
thanks,
Ian