The decorations area mixture of 1920s-50s (20s ones are quite hard to get hold of now, and are pretty expensive!). The tinsel is modern, but of the thinner type, for a more contemporaneous appearance. As can be seen, the (modern ) candles have at some point suffered heat damage!
This spruce tree is decorated using 1930s-50s decorations, to achieve a 30s - 40s style:
1930s Christmas biscuit tin to follow...