sounds weird but i have a lyra horse is a so pure white that can't anywhere be found and soft in touch!!!!
Lyra produced quite a few western houses also, i remember toy shops in the early 80s litely flooded with them , not many these days on ebay etc etc though . it should be noted though that Lyra quality was perfect in early sets such as 3232,3245, 3317 ( the first glowing ghost, this was very popular with us kids when they came out !!!) , 3422 ( western bank), 3742 - Circus horses ( i bet ya your white horse is from these ...) , these ' good ' sets had the logo Playmobil system on and were perfect in my opinion ,( sometimes parts were missign though , but quickly replashed with a phone!) , whereas the later ' not so good' set were called ' New ' playmobil ...
.... Playmoibl was by far number 1 toy in the late 70s, early and mid 80s in Greece .....