Those were pretty common here for a long time. Generally you either had lower cabinets built underneath so the job was at counter level, or you could buy matching metal cabinets that they sat on, to replace a wood burning range or to fit in a kitchen without built ins. My mums parents did this in the early 60s and then replaced it with an oak kitchen with a wall oven in the 80s.
In the 60s and 70s, these were seen as a cheaper compromise, between the cost of a fitted wall oven, but still being able to have the oven at eye level.
Michael’s mum has quite a high end mid 70s kitchen with one of these built in. We replaced the original stove about 10 years ago, with a modern version.