There are two 61's one is based on the Veco 61 and is ringed, the abc is called the Twister 61 and also seems to be baffled, it has gold colored cooling fins and looks to be screwed on. One thing I failed to post if you have the ringed version it uses a dykes ring which can be a real pain to start by hand and realy needs a starter but it does start very easy with a starter. Here's a pic of the ringed version.
Hope this helps
Dwayne