I have owned this amplifier for 15y and the previous owner had it for 18y - that's 33y of it's 55y life documented. In 'A Service Engineers Guide to the Vox AC30 Valve Amplifier' p54 it says AC30's from 1964 have a chassis number in the range 3000 whereas those from 1965 are in the 7000 range. The serial number for this chassis is just over 5000 but the under chassis view matches the 1964 AC30/6 power supply and output stage on p27 of above guide. When I purchased the amplifier it had one original blue bulldog and a Celestion G12 replacement. I purchased an age matched blue bulldog and replaced the Celestion G12 to get a matching pair. Just prior to the previos owner purchasing it 33y ago it was professionally recovered using genuine Vox components. The vents were enlarged to improve ventilatuin at this time. The previous owner documents the back panel serial number plate as this was missing at the time. I turn it on and play it from time to time t keep the parts exercised and check it is fully working. This amp has been a treasured part of my life so the buyer will need to come to my house and go through everything with me before purchasing.