The above amulet is LP Boon KleebBua MekkaPhat, Wat KlangBangkaew of early 2470s. The word KleebBua means lotus petal, it's so called because the amulet shape looks like a lotus petal.

MekkaPhat is a kind of efficacious alloy of shining black color. Guru monks of the old time liked to use the alloy of this kind to make amulets due to its efficacy by nature.

KleebBua MekkaPhat is LP Boon's popular economy-price amulets due to their lower price but so great for their efficacies and properties. The front side is Buddha sitting on lotus base and the background is Buddha's Rassami or radius. The reverse side 

LP Boon, who has enormous knowledge on BuddhaKom, was one of the greatest pre-war Guru monks of the country. He was a close friend of many contemporarily famous Guru monks viz LP Nak of Wat HuaiJorake, ChaoKhun Vinai Kitkosol and ChaoKhun Phrom of Wat Gallaya, LP Taab Wat Thong, and Somdej Phra Sangkharaj (Pae)--the Supreme Patriarch of Wat Suthat. 

Famous ChaoKhun Sri (Sondh) had first learned with LP Boon and later left for Wat Suthat and became the Supreme Patriarch's right hand and closest disciple. For LP Chaem of Wat Takong, a greatest and most famous Guru monk of NakonPathom and the teacher of LP Tae Kongthong, was also a disciple of LP Boon.  

All of LP Boon's amulets are so efficacious and has comprehensive properties, such as Metta, KlaewKlaad, longivity of life, good fate and fortune, etc.

LP Boon passed away in B.E.2478 at the age of 89, he ordained and sustained for his monkhood life for 68 years.