General Layman's Aesthetic Spying Screen Mod 1.12.2 (GLASS) - 9Minecraft.Net
My favourite texture pack for the spyglass (link in comments) : r/Minecraft
Minecraft: How To Make A Spyglass
Spyglass Zoom - Mods - Minecraft - CurseForge
Minecraft with CUSTOM SPYGLASSES! - YouTube
Spyglass Minecraft Addon / Mod
FORGE] [1.4.7] [UPDATED] The Spy Glass Mod, SNEEKY 1 WAY GLASS ! UPDATED AND AWESOME! - Minecraft Mods - Mapping and Modding: Java Edition - Minecraft Forum - Minecraft Forum