Oldest machine

Wai-Sun Chia wrote: Why not though? Assuming it's a faithful restoration using period parts [1] (rather than emulating bits using modern parts) and it works then it should qualify... I have no objections to museum machines being mentioned if the poster is directly connected with that museum [2] (nor would I mind hearing about ancient hardware that people are still using in a commercial capacity :) [1] Someone told me of one museum with an old machine where the core memory had been torn out and replaced with modern DRAM, but I can't recall what machine or where - to me though it's non-original at that point because it's not a restoration faithful to the original hardware. [2] I've mentioned our early 60's Marconi in a museum capacity. Oldest machine in my private collection is a lot newer - probably my Acorn System 1, circa 1979. I don't have room for big stuff, and the older a machine is the bigger it tends to be :-) I suppose I'm just curious as to what systems from the 1940's to 1970's have survived, as most of the talk on here seems to be of more recent (1970's and 1980's) hardware and very little gets said about the earlier stuff. cheers Jules