Bill, thanks for that site for the plastic covers- I note that they cost more than the original model with the airplane! But 1970 was 40 years ago, I guess. I will need some for sure.
I paid a lot for the green Me-109 but I have been looking for 15 years at least. I got mine in an auction in the UK and it was in the 275 pound range as I recall.

Actually I do not wish to recall...LOL
Only really passionate collectors like you or me would pay that much for one. Well I guess there are others or I would have gotten it for much less.
Finally got a nice Hubley Spirit of St Louis, reasonable price but not NOS. That was the last cast iron toy plane I wanted for the collection, just as well.