🇯🇵 Japan Faceplate Engravings Lookup Directory (フロント刻印)
In Japan, identifying a mortise lock requires no complex door teardown. Simply look at the stamped English letters on the door edge faceplate (フロント刻印) to determine the exact lock mechanism, CAD drilling footprint, and smart retrofit accessory.
Stamped Code & Retrofit Compatibility Matrix (MIWA / GOAL / SHOWA)
| Brand | Faceplate Code | Lock Mechanism | Standard Backset | Door Thickness | Retrofit Feasibility | Recommended Kit |
|---|---|---|---|---|---|---|
| MIWA | LA / 13LA / LA・MA | Mortise latch & deadbolt (Mansion dominant) | 51mm / 64mm | 33 ~ 42mm | Very Easy | SwitchBot Lock Pro (Adapter C) / Qrio Q-SL2 |
| MIWA | BH / DZ / LD / LDSP | Mortise deadbolt auxiliary | 31 / 51 / 64mm | 33 ~ 42mm | Easy | Universal clamp / SwitchBot |
| MIWA | LSP / LE / SWLSP / TE | Small backset mortise lock | 51mm / 64mm | 28 ~ 40mm | Easy | SwitchBot / Qrio / Sada-Elinx |
| GOAL | LX / AS・LX / LG | High security mortise handle lock | 38 / 51 / 64mm | 33 ~ 43mm | Easy | SwitchBot Lock Pro (Adapter G) / Aqara U200 |
| SHOWA | CL / 516 / 397 | Mortise latch lock | 50mm / 60mm | 30 ~ 42mm | Moderate | Extended motor rotation required |