Fatboise wrote:
When the new window arrived I noticed that
there was no "argon" stickers on the glass. Is there any way of telling
what the gap is filled with, I assume if I ask the company who made them
they'll say it's whatever I ordered??

There's no easy way I know... ask the company, they will
tell you what you ordered/got - if you did not order the
windows "argon filled", they'll probably have ordinary
air in 'em. Won't make that a discernable difference IMO.