Stationary vs Stationery

When you run into a construction site, there is an interesting invention on the shielding board nowadays. When we walked around Nihonbashi area, we found the old picture on the board painting featuring the history of an under-constructed site from an old time. It said 'Stationary Shop Haibara since 1806'.

The interesting thing was that Haibara is the shop of Japanese traditional papers including "stationery", but the sentence was not "stationery", because it described that not changing in quantity and quality since 1806. Stationary and Stationery. It's interesting.