Hi Arran,
welcome to the forum, war merit crosses came both with and without makers marks to the ring, so a cross without one is not a bad sign, generally a cross with a makers mark is worth a little more but certainly not a problem not to have a makers mark.
Arran, did you buy some medals from us last month including some WW2 stars? If it was yourself I think you asked about how to tell the age of the ribbons? I forgot to say if you would rather have older ribbons, it is no problem for you to bring them down next time you visit the shop and swap the ribbons for older looking ones so they all look the same, we usually have lots of stars in stock so that would not be a problem