Thank you for the replies.
I was a bit concerned about the cracks in the pivot rivet, as I have nothing to compare this model with in my collection.
I was however to find some close up photos on several K-11 models that were listed on a "well known auction site" and they did show similar cracks in their rivets. (see pic below) So apparently this does occur on these when these rivets are struck.
I think this example Metallic Blue Cab /Yellow orange trailer is notable as it implies that perhaps there were left over Metallic Blue cabs left over from the gold trailer version, that were then paired up to the newer yellow/orange - as occurred similarly on the K-8, during its color change over. Either that, or perhaps there was just one last metallic blue cab left over that got tossed in with the lot. Either way, this seems to be a rather rare find !
Perhaps some other examples will turn up, now that there are other eyes are on the look-out.
Very pleased to have shared it with you here and to have it in my collection .
zBret
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