Information continued from Lelystad Air Show, 2004, the following additional information was sent to me:

Hamilton Aircraft Co., Tucson, AZ purchased 68 surplus Expeditors in 1968 and did the modifications needed for US civil certification. It is believed that this included A-904, registered as N7820. They then sold 45 of them (including N7820) to Priority Air Transport of Redwood City, CA, for use in passenger service and on U.S. Postal Service contract mail routes, however service with Priority lasted only until 1970 when they ceased operations.
By June 1982, CF-AID was owned by Rolf A. Yri, Surrey, BC and was finished as a warbird in RCAF Air Transport Command markings. When sold/exported in 1988 the Canadian owner was listed as Canadian Warplane Heritage, Vancouver, BC.
It was registered N5369X on 04Apr1988 to Twin Air USA Inc., Rockford,IL and 10 days later registered to the Dutch Dakota Association.
It arrived in Amsterdam on 31May1988. At some point it was reregistered PH-DDB (PH-BBA had been reserved for it, in 1987, but not taken up) but continued to wear the US registration.
Reportedly it underwent a 4 year overhaul/restoration and made first flight on 30Jan'93.

UPDATE: Beech 3NM RCAF 1578 c/n CA-264 was involved in a Category B accident on 18Jul1964 at Summerside, PEI, Canada and its wings were at some point installed on A-904. This was not an unusual occurrence.
Handed over to Stichting Vliegsport, Gilze Rijen.
By October 1998, it was finished in Dutch Air Force markings 'G-29'.
In 2002 it was registered as PH-KHV.

Contributed by Bob Parmerter, author of Beech 18, published by the 'Twin Beech 18 Society', a division of The Staggerwing Museum Foundation, Inc. - Tullahoma, Tennessee

I can add one item in reply to your info. The A-904 c/n was changed to CA-254 prior to delivery to the RCAF. The 281 post-WWII Expeditor 3s were from a batch of 1035 Model D18S aircraft with c/n's from A-1 to A-1035. The RCAF aircraft had their c/n's changed. They had a CA- prefix, but the numbers were also different from their original A- prefixed c/n's.
It took a while, but I was able to come up with my "magic decoder ring" to tie up the A- and CA- series of c/n's. So far, I haven't been able to find out why they were changed or whether it took place before or after any were actually manufactured.
Contributed by Jeff Rankin-Lowe, author "The Royal Canadian Air Force in the 1950's"

Bob replied to Jeff's message:
I'm not sure that it is accurate to say that the c/ns were changed. I have a copy of a Beech "Export Division Model D18S Owners List" and it lists the 280 RCAF aircraft in numerical A- c/n order with the RCAF c/n CA- in parenthesis, followed by the RCAF serial and then the delivery date:
for example A-601 (CA-1) RCAF 1426 Del. 8-28-51
I think of the 280 aircraft as having dual c/ns. I chose to use the A- series c/n in my book's registration index because I have always used it for convenience sake in my record keeping (using a card for each aircraft it is simplier to arrange them using all A- c/ns). In a future production list perhaps another choice should be considered. As to why the CA- was used I think it's fair to assume that the RCAF wanted a separate and distinct c/n series for their 280 aircraft. I'm not sure which was used on the data plate on the aircraft but I suspect it was CA- (I'll try and find that out) . I do have some Hamilton Aircraft inventory records that list 18 ex RCAF 3N/3NM models they owned at an unspecified time, and for 16 of them they listed the c/n as CA- and for two they listed both the A- and CA- numbers.

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Updated: 31-Dec-2017