Age of Welding machine

[prentice]

I have recently bought a second hand Pro 90 and was wondering if there is any way to determine the age of it? I can't find any serial number anywhere so would like some help if possible.

 

[madkayaker]

Photo might help as there has been a couple of changes in design

 

[pedrobedro]

Cut it in two and count the rings. No sorry that only works for trees

 

[shenion]

Look at the circuit board. Some of the parts or the board itself may have date codes.

 

[prentice]

Have added some pics, still can't see any numbers!

 

[madkayaker]

It's been improved with a fan!

 

[shenion]

Look at the markings on the parts shown with arrows. May also be a date code on the relay.

 

[prentice]

Will do, Cheers.