Unfortunately, Gmwebs is totally wrong. I own a total of 8 RMRs in both the RM06 and RM07 dot sizes, in both Type 1 and Type 2 configuration. The only way to differentiate the two Types of RMR is to examine the layout of the battery contacts in the battery compartment. There is no way to tell one type from the other based on the model number (they are identical for both Types), box markings or the external sight markings. Only the layout of the internal battery connections will determine the Type of RMR that you have.
Do a Google search of "Type 1 versus type 2 Trijicon RMR" and you will see exactly what I am talking about with explanatory photos.
The Type 2 was introduced in 2017 with improved battery contacts to prevent flickering of the dot due to a poor connection. You will be very lucky to get $600 for a new, unused Type 1 RMR RM06 or RM07. $500 to $550 is more realistic IMHO. Everyone wants the Type 2, even though the use of Duracell-brand 2032 batteries, a shim on the battery and/or bending out the battery contacts will all prevent dot flicker in a Type 1 RMR. Aside from the Battery Contacts and hardening of the electronics, there is little difference between the two Types of RMR.
Good luck with the sale of your Type 1.