Hi Leni,love your Scmetterlings they are one of Walthers finest! Im looking for the amber one myself.You are correct about the blue I think they did deeper blue later on in the 50s or 60s,I have noticed the same blue in the Greta vases,pelikan frog and Irene vases.I also think that the part frosted Schmetterlings again were made later,like the pink and the deeper blue.I have seen once a part frosted green version! Would love that! You have made a marvellous display of your Schmetterlings I like it! Nige