Monthly bill inspection device in use in Peru, exhibiting magnifying glass for inspection of depth and lit up protection strip Usually, anti-counterfeiting actions concerned including fine element with elevated intaglio printing on bills which would enable non-professionals to easily spot forgeries. On coins, milled or reeded (marked with parallel grooves) https://socialimarketing.com/story4967912/little-known-facts-about-copyright-5-gbp-bills