Westerners have a long history of painting with wooden boards as the base material, which can be traced back to the portrait of Fayoum in Egypt during the Hellenistic period in the early AD, while the history of oil painting is only five or six hundred years. In the west, in the15th century, the Van Eyck brothers from the Netherlands developed a stable formula of oil painting materials, and then oil painting really entered the history of painting as a mainstream painting material. Before Van Eyck, many painters explored the application of dry vegetable oil as a blending agent in painting, but they usually mixed oil with egg yolk, which is called oily Tamperina. This technique was very common in the Renaissance and was also found in Leonardo da Vinci's later works. Prior to this, the painter's main toner was egg yolk, the so-called water-based Tampere, which was mainly popular in medieval icon paintings and early Renaissance paintings, and all water-based Tampere paintings were based on wooden boards. This technique mainly originated from medieval European icon painting, while the technique of wooden icon painting originated from coffin portrait, also known as Fayoum portrait, which prevailed in Fayoum, Egypt during the Hellenistic period. Fayoum's portrait is a wooden board coated with a layer of textile and then coated with beeswax as a blending agent. This form of painting was preserved by medieval icons, and then left over to the paintings of Tempella in the Renaissance. This kind of painting was very popular in Florence, Italy, and Venetian painters liked to paint with light linen as the base. After the appearance of oil painting, the requirements for base materials became simple. The thickness of pure linen substrate is enough to meet the needs of painting and preservation, and the wooden substrate gradually fades out of the historical stage of painting. However, this tradition is still preserved by western painters. To this day, there are still painters who like to paint on boards. These people often don't simply use oil paintings as painting materials, but mix Tampere's techniques in painting, such as Guillermo García López in Spain, agnini in Italy and Wise in the United States.

Therefore, it is impossible to determine the time and source of painting only by the clues you mentioned. In different periods and regions, artists like to use different kinds of wood and cutting methods. In ancient times, it was mostly solid wood splicing, with thick boards and tenons on the back. You can also see the country or genre from tenors and tenors. If it's plywood, that's another matter. This kind of thing appeared late enough, and people who paint with it are modern people. In addition, whose signature it is is more important. Just because the Latin letter doesn't mean it must be English. Italian, French, German and Spanish are all Latin letters. Many painters in China now like to sign words in Latin letters, some in pinyin, some in abbreviations, and some in foreign languages. Then the style of painting. The painting styles and techniques in different periods are completely different, so it is easier to determine the painting age according to the style. Generally speaking, the birth time of painting works will be equal to or later than the period when this style is popular (it may be copying or counterfeiting).