The 66-67 Roster does not show Edward Albert as a member and the cars are not listed by serial number, only by year, model and color.
The 1970 Roster does not show him as a member.
Also 63R-1204 and 63R-1889 are not listed.
The change was made at a body number and not a serial number.
My Avanti is R4137 and body number RQ-2998. Built April, 1963
R4341 has body number RQ-3011. Built May, 1963
R4130 has a South Bend body, RQ-5190. Built April, 1963
Without some documentation there is no way to know for sure when it was placed in service as a demonstrator or when it was sold.
It could have been placed in service in October or a later date.
Studebaker paid some incentives to dealers at the end of the model year and this may one of them.
The $200.00 would be a credit to the dealer when the Avanti was put into service as a demonstrator.
The Avanti could have been in stock for several months, however it would not qualify for the credit until the dealer registered it with Studebaker's Demonstrator Program.
From Studebaker:
" The retail purchaser of any vehicles previously used as a demonstrator is entitled to any mileage or time period remaining in the warranty, calculated from the date the vehicle was first placed in service as a demonstrator"