Europa/Europe badges appeared with the S2. The S1 had the Lotus emblem upfront, two small commemorative shields on either rear wing and that's it. One shield listed the '65 Indianapolis win and the other the world championship in '63. The only mention of "Europa" is in the owner's manual and the service book.
The "Europe" badge is rare as it was only used in one/few juristictions where another company had trademarked "Europa".