Thank's for the additional pictures and in them, it looks convincing as a genuine all Silver model and the Silver certainly seems to match the mobile canteen model photographed with it.
I personally do not know the 'Time-Line' of the Aston Martin, but the rivets do look like the early type to be seen on a lot of models from the Grey metal wheel period and you can see from the other Aston Martin model in your pictures that the rivets have been treated differently and this is a result of Lesney improving the production method on their models and with Grey plastic wheels, this will be a later model.
I notice the axle 'Crimp' is on the 'Off-Side' of the car as opposed to the 'Near-Side' as seen on the example pictured here...http://www.vintagebritishdiecasts.co.uk ... /xx53a.htm but as this happens on other early models it may just be a very late first production run model.
As regards the Silver trim on the grille, the pictures do not make it show too clearly, but again if it is a very late first production model, Lesney might just have started adding it before the main body colour change.
While all the above could be applicable to your model, It ideally needs to be seen 'In-Hand' by other forum members if at all possible, before a final verdict can be made, it certainly is an unusual model and I have my fingers crossed for you and hope it is a genuine rare Silver example.
GHOSTHUNTER.
Silver Aston Martin
Re: Silver Aston Martin
Thanks for the feedback. I wish I was going to the Albuquerque show this year but still haven't been able to get that trip planned. I will bring it to Macungie, PA and York this fall and see if Charlie Mack or Ron can check it over. I've seen posts where Kwakers goes to Macungie maybe I can meet him there but I've never met him before.