"Love tokens" usually have people's name or initials engraved on them. So I suspect they are the initials "IG" or perhaps "JG" (since I and J were pretty much interchangeable as the first letter in a name back then), rather than a denomination "1G".
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis