Signs of the Past in the Present

There is an area inside the heart of the city which contains small alleyways, dating back to the post second world war era, when it was used as a black market, then covered, then mostly abandoned (so I was told) and now has experienced somewhat of a retro/nostalgic revival- which is exactly what sent me into those lanes in the first place.  Now, while I have been there before, doing my usual snooping around, I did not notice one place in particular which is featured here.  At first, I thought it to be part of the retro design, very similar to what I saw in a nostalgia museum, where it was only the facade.  When I looked closer, I saw a sign that said "Inside of here is Showa (the time period)", I tried the door, but it looked rather flimsy and suspected it to be a stage set of sorts.  But once I looked further, I realized that there was a menu with prices, and that in fact it was a real life bar, except one that opened later in the evening- but that night I had plans (someone was visiting from the babylon that is Tokyo), so I made a mental note to return there one evening, and hopefully it will take me straight into the heart of the past.