Do all Flip-up Heads Look The Same

Hi All,

I have been looking at several FP4NC, and some say they
have a 6,300 rpm spindles, but the spindles look different.
The newer ones are rectangular with a 45 degree slope near
the top, and some of them are a raised rectangular face with
what looks like two round shapes on top, which I assume to be
a drawbar mechanism. They both look to have a flip-up mechanism
on top of ram, and connected to the spindle.

Do both of these have the duplex angular bearings instead of the
needle bearings. Are both of these 6,300 rpm?

I have seen some claims of a 5,000 rpm spindles - is there such
an animal?

Can you tell by the numbers on the name plate, which is which,
what is what?

Is there a web site that spells out information on all the different
Deckel milling machine models?

Thank you for any help you can provide,

Paul Hoffman