These blades are 10 days old, mowed my 2 acres twice, no gravel, no ditches, just really flat land, back edge of blades start getting super thin after first mow then start to chip off pieces on second mow, like clock work
Pull the other one.
10 days old, with the cutting edged scalloped in 1/2 " and flute erroded and cracking off along the bend line plus the flute tip flung off and bent backwards, not likely
And if that shot was taken from underneath the mower then the blades is upside down.
So this does not add up.
I have customers with council ( town hall to some ) contracts to mow road verges in rural areas.
They run over bricks , old car parts, bottles , gravel, dumped concrete, steel cans, old matresses, dead animals, saplings , sand and heaven only knows what else and they don't get wear like that in 200 hours.
And you are trying to tell us that is 4 hours cutting.
I don't know what you are playing at, but I got better things to do with my time.
Also I am yet to find a blade marked top or bottom.
I fit original blades, Stens blades, Oregon blades, Gripskies blades , ASM blades & Rotary blades. The only marking I have ever come across on any of them is "Grass Side " or "Grass This Side". Some of the ASM blades have something written on them in Spanish and again it in on the grass side. I think the Gator blades have their Oregon part number on the top side.
SO good by & good luck.