Theres a few on google images. It looks as though production started in 1970. So yours would likely have been one of the first few made, early to mid 1970. That cab on reverb has been totally retolexed and regrilled, but it was made after yours (late 1970), you can tell by the castors. Who pays over 3k for a badly refurbished cab? Unbelievable some of these prices. If he got 3k for that you should ask 10k for yours.